I find it rather funny that a friend of mine launched a D&D game in a setting similar to yours. One that took place on a planet consisting entirely of earth motes. The planet was once whole but broke apart in an ancient cataclysm. Except there wasn’t any technology beyond just magic. Unfortunately the game fell apart. but his site is still up, http://www.obsidianportal.com/campaigns/draconic-skies I always thought it would be awesome to have a world setting with nothing but earth motes and steam/diesel punk type technology. I am interested to see where your game goes!